Spice simulation help

  1. ranger

    ranger 1,684
    Gold Member

    I'm currently learning spice. I need help with a very simple circuit.
    [​IMG]

    Here is the netlist:

    Example netlist
    v1 1 0 dc 15
    r1 1 0 2.2k
    r2 1 2 3.3k
    r3 2 0 150
    .end

    When I run it in spice(2g6) I get:

    Code (Text):
    ******* 12/04/10 ********  SPICE 2G.6    15/3/83 ******** 21:24:57 ****
    **** EXAMPLE NETLIST                                                                
    ****     INPUT LISTING                    TEMPERATURE =   27.000 DEG C
    ***********************************************************************


    V1 1 0 DC 15    
    R1 1 0 2.2K    
    R2 1 2 3.3K    
    R3 2 0 150      

    *ERROR*:  .END card missing


    Input deck (file) contains no data.
     
    The tutorial I am using says to do exactly that, but yet I get this error. As you can see I have .end in my netlist. Whats wrong?

    --thank you.
     
  2. jcsd
  3. chroot

    chroot 10,426
    Staff Emeritus
    Science Advisor
    Gold Member

    Is it possible your version of spice is case-sensitive? Have you tried using .END instead of .end?

    - Warren
     
  4. ranger

    ranger 1,684
    Gold Member

    I still get the same error with .END

    Its weird though, doing a simple RC example netlist:

    Basic RC circuit
    r 1 2 1.0
    *l 1 2 1.0
    c 2 0 1.0
    vin 1 0 pulse (0 1) ac 1
    .tran 0.1 7.0
    *.ac dec 10 .01 10
    .plot tran v(2) i(vin)
    *.plot ac vdb(2) xlog
    .end

    The simulation goes about just fine.
     
  5. berkeman

    Staff: Mentor

    Looks like it should work. I'll run it tomorrow at work (I'm at home now) to see what happens. In the mean time, are there any hidden characters maybe in the file? Some goofy ctrl-oops character that crept in?


    PS -- Very cool links in your footer. I'll have to spend some time browsing those pages more....
     
  6. ranger

    ranger 1,684
    Gold Member


    Unfortunately they arent any. At first I simply copied the netlist, but after I typed them out and saved them in a new file, I still get the same error.
     
  7. berkeman

    Staff: Mentor

    You text file runs fine in my MicroCAP8 SPICE simulator. I copied your text from your post and pasted it into an input file, and ran a transient analysis. MC8 ended up with this file after the transient analysis:

     
  8. ranger

    ranger 1,684
    Gold Member

    Using your netlist with .TRAN, etc. I still get the same error. Mayb there us something wrong with the program?

    I got the program from here (towards the bottom of the page).

    Its like it refuses to read .END

    What OS are you running SPICE on? Is MicroCAP8 SPICE free?
     
  9. berkeman

    Staff: Mentor

    I've run MicroCAP on NT and XP. This current MC8 installation is running on my XP PC. I don't know if there is a lower-cost student version of MicroCAP, but you could check Spectrum Software's website:

    http://www.spectrum-soft.com/index.shtm

    Have you looked in the Help menu of your program to see if it requires something special for the .end statement? Does it come with any sample files? Do you have any friends who are also using that program?
     
  10. ranger

    ranger 1,684
    Gold Member

    There is no help file, all I was told to download were three files (no help or samples). All of my friends are using multisim instead :)

    I've found a sample netlist (elsewhere):
    Code (Text):

    Basic RC circuit
    r 1 2 1.0
    *l 1 2 1.0
    c 2 0 1.0
    vin 1 0 pulse (0 1) ac 1
    .tran 0.1 7.0
    *.ac dec 10 .01 10
    .plot tran v(2) i(vin)
    *.plot ac vdb(2) xlog
    .end
     
    SPICE can simulate this circuit though.
     
  11. pervect

    pervect 7,940
    Staff Emeritus
    Science Advisor

    Try adding an .op card to your first netlist. You didn't really instruct the program to do an analysis, that might be the problem.
     
  12. ranger

    ranger 1,684
    Gold Member

    Code (Text):

    Example netlist
    V1 1 0 DC 15
    R1 1 0 2.2K
    R2 1 2 3.3K
    R3 2 0 150
    .end
    .op
     
    Output:
    Code (Text):
    ******* 13/04/10 ********  SPICE 2G.6    15/3/83 ******** 15:55:19 ****
    **** MULTIPLE DC SOURCES                                                            
    ****     INPUT LISTING                    TEMPERATURE =   27.000 DEG C
    ***********************************************************************


    V1 1 0 DC 15    
    R1 1 0 2.2K    
    R2 1 2 3.3K    
    R3 2 0 150      
    .END    




    ******* 13/04/10 ********  SPICE 2G.6    15/3/83 ******** 15:55:19 ****
    **** MULTIPLE DC SOURCES                                                            
    ****     SMALL SIGNAL BIAS SOLUTION       TEMPERATURE =   27.000 DEG C
    ***********************************************************************

     NODE   VOLTAGE     NODE   VOLTAGE

    (  1)   15.0000    (  2)    0.6522


        VOLTAGE SOURCE CURRENTS

        NAME       CURRENT

        V1       -1.117E-02

        TOTAL POWER DISSIPATION:   1.67E-01 WATTS

             JOB CONCLUDED

             TOTAL JOB TIME            0.01
     
    That did the job! It works. Its funny how the guy that wrote the tutorial didnt mention this. What is .op for pervect? Thanks.
     
  13. chroot

    chroot 10,426
    Staff Emeritus
    Science Advisor
    Gold Member

    I suspect that you may actually need a newline character after the .end.... i.e., the last line of the file should be blank. Worth a try, yes?

    .op runs an operating-point (bias point) analysis.

    - Warren
     
  14. ranger

    ranger 1,684
    Gold Member

    That newline did the trick.

    Code (Text):


    ******* 13/04/10 ********  SPICE 2G.6    15/3/83 ******** 18:27:58 ****
    **** EXAMPLE NETLIST                                                                
    ****     INPUT LISTING                    TEMPERATURE =   27.000 DEG C
    ***********************************************************************


    V1 1 0 DC 25    
    R1 1 0 2.2K    
    R2 1 2 7.3K    
    R3 2 0 150      
    .END    




    ******* 13/04/10 ********  SPICE 2G.6    15/3/83 ******** 18:27:58 ****
    **** EXAMPLE NETLIST                                                                
    ****     SMALL SIGNAL BIAS SOLUTION       TEMPERATURE =   27.000 DEG C
    ***********************************************************************

     NODE   VOLTAGE     NODE   VOLTAGE

    (  1)   25.0000    (  2)    0.5034


        VOLTAGE SOURCE CURRENTS

        NAME       CURRENT

        V1       -1.472E-02

        TOTAL POWER DISSIPATION:   3.68E-01 WATTS

             JOB CONCLUDED

             TOTAL JOB TIME            0.00




    ******* 13/04/10 ********  SPICE 2G.6    15/3/83 ******** 18:27:58 ****
    ****                                                                                
    ****     INPUT LISTING                    TEMPERATURE =   27.000 DEG C
    ***********************************************************************



    *ERROR*:  .END card missing

     
    It still says that .end is missing. But the simulation goes through though.
     
Know someone interested in this topic? Share a link to this question via email, Google+, Twitter, or Facebook

Have something to add?